Get rid of promotedType=none annotations

pkg/front_end/testcases/inference/generic_methods_dart_math_min_max.dart

 // Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /*@testedFeatures=inference*/
 library test;
 
 import 'dart:math';
 
-void printInt(int x) => print(/*@promotedType=none*/ x);
-void printDouble(double x) => print(/*@promotedType=none*/ x);
+void printInt(int x) => print(x);
+void printDouble(double x) => print(x);
 
 num myMax(num x, num y) =>
-    /*@typeArgs=num*/ max(/*@promotedType=none*/ x, /*@promotedType=none*/ y);
+    /*@typeArgs=num*/ max(x, y);
 
 f() {
   // Okay if static types match.
   printInt(/*@typeArgs=int*/ max(1, 2));
   printInt(/*@typeArgs=int*/ min(1, 2));
   printDouble(/*@typeArgs=double*/ max(1.0, 2.0));
   printDouble(/*@typeArgs=double*/ min(1.0, 2.0));
 
   // No help for user-defined functions from num->num->num.
   printInt(/*info:DOWN_CAST_IMPLICIT*/ myMax(1, 2));
   printInt(myMax(1, 2) as int);
 
   // Mixing int and double means return type is num.
   printInt(
       /*@typeArgs=int*/ max(1, /*error:ARGUMENT_TYPE_NOT_ASSIGNABLE*/ 2.0));
   printInt(
       /*@typeArgs=int*/ min(1, /*error:ARGUMENT_TYPE_NOT_ASSIGNABLE*/ 2.0));
   printDouble(
       /*@typeArgs=double*/ max(/*error:ARGUMENT_TYPE_NOT_ASSIGNABLE*/ 1, 2.0));
   printDouble(
       /*@typeArgs=double*/ min(/*error:ARGUMENT_TYPE_NOT_ASSIGNABLE*/ 1, 2.0));
 
   // Types other than int and double are not accepted.
   printInt(/*@typeArgs=int*/ min(
       /*error:ARGUMENT_TYPE_NOT_ASSIGNABLE*/ "hi",
       /*error:ARGUMENT_TYPE_NOT_ASSIGNABLE*/ "there"));
 }
 
 main() {}